V4L2摄像头驱动及程序代码 GEC6818开发板

只看该作者 · 2018-9-11 13:58

这个代码实测可用于GEC6818的开发板

单片机源程序如下:

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <sys/mman.h>

#include <linux/input.h>

#include <strings.h>

#include &quot;jpeglib.h&quot;

#include &quot;api_v4l2.h&quot;

#include <stdlib.h>

#include <pthread.h>

#define LCD_WIDTH 800

#define LCD_HEIGHT 480

int *p = NULL;

int lcd_fd = -1;

int is_open_camera = 0;

int is_video_play = 0;

int is_vedio_record = 0;

int video_count=1;

FrameBuffer camera_buf;

int video_fd;

char bmp[3][10] =

{

      &quot;1.bmp&quot;,

      &quot;2.bmp&quot;,

      &quot;girl.bmp&quot;

};

int lcd_open(void)

{

      lcd_fd = open(&quot;/dev/fb0&quot;,O_RDWR);

      if(lcd_fd < 0)

      {

            perror(&quot;lcd open failed&quot;);

            return 0;

      }

      p = mmap(NULL, LCD_WIDTH*LCD_HEIGHT*4,

                     PROT_READ | PROT_WRITE,

                     MAP_SHARED,

                     lcd_fd,

                     0);

      if (NULL == p)

      {

            perror(&quot;lcd mmap error: &quot;);

            return -1;

      }

      return 0;

}

int lcd_draw_point(int x, int y, int color)

{

      if (x > 800)

      {

            printf(&quot;value of X-coordinates is over: %d\n&quot;, LCD_WIDTH);

            return -1;

      }

      if (y > 480)

      {

            printf(&quot;value of Y-coordinates is over: %d\n&quot;, LCD_HEIGHT);

            return -1;

      }

      *(p + x + y*800) = color;

      return 0;

}

void lcd_draw_bmp(const char *file_name, int x0, int y0)

{

      int fd;

      int bmp_width;

      int bmp_height;

      char buf[54];

      fd = open(file_name, O_RDONLY);

      if (fd < 0)

      {

            perror(&quot;open file error: &quot;);

            return ;

      }

            /* 读取位图头部信息 */

      read(fd,buf,54);



      /* 宽度  */

      bmp_width =buf[18];

      bmp_width|=buf[19]<<8;

      //printf(&quot;bmp_width=%d\r\n&quot;,bmp_width);



      /* 高度  */

      bmp_height =buf[22];

      bmp_height|=buf[23]<<8;

      //printf(&quot;bmp_height=%d\r\n&quot;,bmp_height);



      int len;

      len = bmp_width*bmp_height*3;



      //跳过前边54个字节，这54个字节是用来存储bmp图片的相关信息的

      lseek(fd, 54, SEEK_SET);



      //从第55个字节开始，读取bmp图片的像素数组

      char bmp_buf[len];

      read(fd, bmp_buf, len);//因为这个bmp图片是24位色

      close(fd);

      int color, x, y, i = 0;

      unsigned char r, g, b;

      for (y = 0; y < bmp_height; y++)

      {

            for (x = 0; x < bmp_width; x++)

            {

                     //将一个24bit //bmp图片的像素点转换为LCD的一个像素点

                     b = bmp_buf[i++];

                     g = bmp_buf[i++];

                     r = bmp_buf[i++];

                     color = (r << 16) | (g << 8) | b;

                     lcd_draw_point(x + x0, bmp_height-y+y0-1, color);

            }

      }

}

int get_pos(int *pos_x,int *pos_y)

{

      // 打开触摸屏设备

      struct input_event buf;

      bzero(&buf, sizeof(buf));

      int ts = open(&quot;/dev/input/event0&quot;, O_RDONLY);

      if(ts < 0)

      {

            perror(&quot;open touch srceen failed&quot;);

            return -1;

      }

      while(1)

      {

            // 循环地读取触摸屏信息

            read(ts, &buf, sizeof(buf));

            // 遇到 X轴坐标事件

            if(buf.type == EV_ABS && buf.code == ABS_X)

            {

                     *pos_x = buf.value;

                     printf(&quot;(%d, &quot;, *pos_x);

            }

            // 遇到 Y轴坐标事件

            if(buf.type == EV_ABS && buf.code == ABS_Y)

            {

                     *pos_y = buf.value;

                     printf(&quot;%d)\n&quot;, *pos_y);

            }

            //判断手指松开

            if (buf.value == 0)

                     break;

      }

}

/****************************************************

*函数名称:file_size_get

*输入参数:pfile_path       -文件路径

*返回值:-1             -失败

               其他值       -文件大小

*说       明:获取文件大小

****************************************************/

unsigned long file_size_get(const char *pfile_path)

{

      unsigned long filesize = -1;

      struct stat statbuff;



      if(stat(pfile_path, &statbuff) < 0)

      {

            return filesize;

      }

      else

      {

            filesize = statbuff.st_size;

      }



      return filesize;

}

/*

x                      :起点

y                      :起点

pjpg_path       ：图片路径

pjpg_buf ：摄像头获取的图像数据，如果你没用摄像头一般设为NULL

jpg_buf_size：摄像头数据的大小,默认设为0

*/

int lcd_draw_jpg(unsigned int x,unsigned int y,const char *pjpg_path,char *pjpg_buf,unsigned int jpg_buf_size)

{

      /*定义解码对象，错误处理对象*/

      struct       jpeg_decompress_struct       cinfo;

      struct       jpeg_error_mgr                      jerr;

      char       g_color_buf[800*480*4];

      char       *pcolor_buf = g_color_buf;

      char       *pjpg;



      unsigned int       i=0;

      unsigned int       color =0;

      unsigned int       count =0;



      unsigned int       x_s = x;

      unsigned int       x_e ;

      unsigned int       y_e ;



                     int       jpg_fd;

      unsigned int       jpg_size;



      unsigned int       jpg_width;

      unsigned int       jpg_height;



      if(pjpg_path!=NULL)

      {

            /* 申请jpg资源，权限可读可写 */

            jpg_fd=open(pjpg_path,O_RDWR);



            if(jpg_fd == -1)

            {

               printf(&quot;open %s error\n&quot;,pjpg_path);



               return -1;

            }

……………………

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V4L2摄像头驱动及程序代码 GEC6818开发板

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